Refractive Laser Beam Measuring Diffusion Coefficient of Concentrated Battery Electrolytes
Refractive Laser Beam Measuring Diffusion Coefficient of Concentrated Battery Electrolytes
复制标题
折射激光束测量浓电池电解液的扩散系数
DOI：
10.1149/1945-7111/ad2954
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发表时间：
2024
影响因子：
3.9
通讯作者：
Feng, Zhange
中科院分区：
文献类型：
--
作者：
Betts, Katherine;Heenkenda, Kushanie Yasasvie;Jacome, Bryan;Kim, Sohyo;Tovar, Michael;Feng, Zhange
对电解质传输特性的透彻理解在替代电池技术的发展中至关重要。作为一个关键参数，扩散系数为了解电解质行为提供了重要见解，特别是对于高能电池的快速充电。现有的测量方法通常受到氧化还原物质的限制，或者由于副反应和/或扩散分布的破坏而提供可疑的准确性。本工作提供了一种新的光学方法来测量液相浓缩电池电解液的扩散系数没有电化学反应。该方法依赖于折射激光束穿过三角形扩散柱中的较小浓度梯度的电解质的偏转。通过将激光束的位置与其浓度相关联，成功提取了一系列硫酸锌电解质的扩散系数D。研究了相同电解质的其他几种物理化学性质，以与浓度依赖性扩散系数相关，包括粘度、电导率和基于振动光谱（红外和拉曼）的微观结构分析。还包括未来的应用，三角柱在现场电化学测量。
A thorough understanding of electrolyte transport properties is crucial in the development of alternative battery technology. As a key parameter, the diffusion coefficient offers important insights into the behavior of electrolytes, especially for fast charge of high-energy batteries. Existing methods of measurement are often limited by redox species or offer questionable accuracy due to side reactions and/or disruption of the diffusion profile. This work provides a novel optical method for measuring diffusion coefficients of liquid-phase concentrated battery electrolytes without electrochemical reactions. The method relies on the deflection of a refractive laser beam passing through an electrolyte of a minor concentration gradient in a triangular diffusion column. The diffusion coefficient, D, for a range of zinc sulfate electrolytes was successfully extracted by correlating the position of the laser beam to its concentration. Several other physicochemical properties of the same electrolytes are studied to correlate to the concentration-dependent diffusion coefficients, including viscosity, conductivity, and microstructure analysis based on vibrational spectroscopy (Infrared and Raman). Also included is the future application of the triangular column for in situ electrochemical measurements.